Early Savannah Coolant Screw Cap

[Pat]

Hi all! Happy New Year! 

 

My year 2000 ICP built Sav (MXP-740) coolant reservoir screw cap is disintegrating and I am desperately looking for a replacement. 

 

It's the version with the rear fuselage air scoop and what looks like an automotive radiator. 

 

Pictures and measurements attached.

 

Any hints on where I can find one greatly appreciated! 

 

Thanks 🙏 

Pat 

 

 

[Blueadventures]

You could make one in epoxy resin, I have done the following in the past.  Cut a circle of stiff thin material 0.5 aluminium or plastic sheet to fit over the opening, then coat the threads and top with mould release wax ( a floor type wax or PVA mould release) {maybe try a a fibre glass repair shop or boat builder)  then mix some expoy resin and thicken with fibre glass mat cut into the smallest pieces so you have a paste (between honey and peanut paste runniness).  Use some plasticine to build a base area to be the bottom of the new cap (if you can't get plasticine then cut a washer like donut to be a tight fit over the thread of the container) Next apply the resin fibre mixture over the container threads and repeat a few to build up the thickness.  You will have a nice cap and you can sand and neaten it up to suit.  Just an idea.

[onetrack]

Pat, you stand a good chance of the Chinese being able to supply a suitable cap. But you'll need to ask the seller for dimensions and thread pitch.

 

https://www.aliexpress.com/w/wholesale-overflow-reservoir-cap.html?spm=a2g0o.productlist.auto_suggest.1.397b1adef07jd0

 

https://www.aliexpress.com/w/wholesale-brake-fluid-reservoir-cap.html?spm=a2g0o.detail.search.0

 

Edited January 3 by onetrack

[skippydiesel]

From the photo's- That cap looks to have many flight hours left in it.

 

The reservoir is is not pressurised, the cap is just to prevent entry of contaminates and to stop the chance of a  turbulence/hard landing coolant spill. Almost any cap, of the right dimension/thread pitch, would do the job.😈

[facthunter]

I reckon it's near  Had it. Have a Look  around lids of 50 Litre Chemical containers and I think it may be a standard type. Looks sun damaged. Better formed thread than most applications. Nev

[onetrack]

That cap is ready to fall apart, I've never seen polypropylene so badly sun-bleached. Finding the correct thread is often the hassle, once you go outside the "regular" suppliers. There's so many different threads on containers and caps, I'm sure a lot of them produce their own thread varieties.

 

Edited January 5 by onetrack

[Blueadventures]

8 minutes ago, onetrack said:

That cap is ready to fall apart, I've never seen polypropylene so badly sun-bleached. Finding the correct thread is often the hassle, once you go outside the "regular" suppliers. There's so many different threads on containers and caps, I'm sure a lot of them produce their own thread varieties.

 

Agree, maybe have a short length of rubber coolant hose ready o cap it, hose plugged one end and secured with a hose clap over threads, as a temporary fix.

[facthunter]

Machlne some off, including the entire top and make an Aluminium cover and with new top to fit  using the rubber washer and glue with 2 Pack epoxy. The least effort I can come up with.  Use a number of bent over tabs(6?) if you want assurance it won't come off. Nev

[Pat]

So far no luck in finding a replacement. Adding two more fotos of the threads. 45mm it is. 

[Blueadventures]

1 hour ago, Pat said:

So far no luck in finding a replacement. Adding two more fotos of the threads. 45mm it is. 

Try my epoxy method on an old oil bottle and see what you think about it.  I've done it a few times.

[skippydiesel]

Dont know the dimensions but what about an oil container cap?

 

Another thought bubble - the collapsible jerry cans/bladders, have a cap which can be ordered separately 😈

[Thruster88]

3 hours ago, Pat said:

So far no luck in finding a replacement. Adding two more fotos of the threads. 45mm it is. 

Have you tried a GL45 or 45-400 cap, can see pics on Ebay.

[facthunter]

It's Probably an ACME thread form.  You could roll an aluminium (thin section) on a former of Mild steel.  I reckon you'd find something used in Industrial Chemicals.  There is Probably a standard. Nylon is fine. Bugger to machine. Nev

Edited Monday at 03:43 AM by facthunter
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[onetrack]

This one could warrant investigation - it's a proper Dayco coolant overflow cap. All the regular bottle caps have dubious construction qualities for use in cooling systems.

 

Dayco Radiator Caps - Coolant Expansion Tank Cap - DRC021 - 2 Years/40,000km

WWW.GSSAUTOPARTS.COM.AU

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Shop the DRC021 Dayco Coolant Expansion / Recovery Tank Cap at GSS Auto Parts. With a 2-year warranty, this cap seals your cooling system to prevent coolant loss. Find the right fit for your vehicle at...

 

[skippydiesel]

Does it strike you as a bit odd, that the Dayco cap you have referred to is a pressure cap - the coolant reservoir should be at ambient pressure. I guess if the cap fits, it can easily be modified, using a 2- 3mm drill bit.😈

[onetrack]

Skippy, many coolant overflow reservoirs have a sealed cap on the reservoir, but an overflow drain tube from below the cap, venting excess pressure to the atmosphere.

[Pat]

Thanks for all the makeshift suggestions. Really appreciated. However, I am very busy with work and family and can't fabriacte something myself, so am just looking to buy a replacement.

[facthunter]

 Maybe find someone who works with Fibreglass and Have Him repair it. ? Just remove the deteriorated material and replace it with glass cloth and resin. . Nev